A type II collar button-shaped artificial cornea

Abstract

The present invention provides a type II collar button-shaped artificial cornea, which includes a front plate with an optical lens cylinder. A skirt is annularly arranged on the outer side surface of the optical lens cylinder. A gasket is also annularly arranged on the outer side surface of the optical lens cylinder. The gasket is located between the front plate and the skirt, and the gasket is attached to the skirt. The type II collar button-shaped artificial cornea of the present invention can better clamp the eyelids, reduce the shedding rate of the artificial cornea, and can be better fixed in the eye.

Description

Technical Field

[0001] The present invention relates to a type II button - type artificial cornea. Background Art

[0002] The indication of the button - type artificial cornea is patients at high risk of corneal transplant rejection. However, for patients with severe dry eye and other conditions who cannot undergo button - type artificial cornea implantation, the type II artificial cornea is the only solution. There is currently no similar product in China for the type II artificial cornea, which is an important supplement to the button - type artificial cornea. The Boston type II artificial cornea in the United States is designed according to the eye anatomical structure of Europeans, and there are significant differences in the eyelid structure and eyelid thickness between Europeans and Chinese. Summary of the Invention

[0003] The purpose of the present invention is to provide a type II button - type artificial cornea, which is more suitable for the eyelids of Asians.

[0004] To achieve the above - mentioned purpose, the technical solution adopted is: a type II button - type artificial cornea, including a front plate with an optical lens column, a skirt is annularly arranged on the outer side surface of the optical lens column, a gasket is also annularly arranged on the outer side surface of the optical lens column, the gasket is located between the front plate and the skirt, and the gasket is in contact with the skirt.

[0005] As a preferred embodiment, the length of the part of the optical lens column between the front plate and the gasket is 1.3 - 1.7 mm.

[0006] As a preferred embodiment, the front surface of the gasket is designed with a convex arc, the rear surface of the gasket is designed with a concave arc, and the rear surface of the gasket is in contact with and bonded to the front surface of the skirt.

[0007] As a preferred embodiment, the diameter of the outer circle of the gasket is the same as the diameter of the front plate.

[0008] As a preferred embodiment, the diameter of the outer circle of the gasket is 4.5 - 4.7 mm, the diameter of the inner circle of the gasket is 3 - 3.5 mm, the thickness of the inner circle of the gasket (the distance between the inner circle of the front surface and the inner circle of the rear surface of the gasket in the gasket center line direction) is 0.5 - 0.9 mm, the distance between the inner circle and the outer circle of the front surface of the gasket in the gasket center line direction is 0.1 - 0.2 mm, the thickness of the gasket (the distance between the inner circle of the front surface and the outer circle of the rear surface of the gasket in the gasket center line direction) is 0.6 - 1.0 mm, and the thickness of the skirt (the distance between the inner circle of the front surface and the outer circle of the rear surface of the skirt in the skirt center line direction) is 0.6 - 1.0 mm.

[0009] As a preferred embodiment, the front surface of the front plate is designed with a convex arc, the rear surface of the front plate is a plane, and the optical lens column is located at the center of the rear surface of the front plate.

[0010] As a preferred embodiment, the diameter of the front plate is 4.5 - 4.7 mm, the distance between the edge of the front surface and the edge of the rear surface of the front plate is 0.5 - 0.7 mm, and the diameter of the optical lens column is 3.3 - 3.5 mm.

[0011] As a preferred embodiment, the front plate, the optical lens column, and the skirt are of an integral structure, and the materials of the front plate, the optical lens column, the skirt, and the gasket are all PMMA (polymethyl methacrylate).

[0012] As a preferred embodiment, it further includes a rear plate with a central hole matching the optical lens column. An annular groove for clamping the rear plate is provided around one end of the outer side of the optical lens column away from the front plate. The skirt is located between the annular groove and the front plate, and multiple side holes are provided on the rear plate.

[0013] As a preferred embodiment, the rear plate is a disc. There are 16 side holes on the rear plate. The centers of 8 of the 16 side holes are located on a first circumference. The center line of the first circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal. The centers of the other 8 of the 16 side holes are located on a second circumference. The center line of the second circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal. The diameters corresponding to the second circumference and the first circumference are not equal.

[0014] Advantageous effects:

[0015] Considering that the eyelids of Asians are relatively thin and a too long lens column is likely to cause difficulty in fixation inside the eye, a gasket is added on the basis of the American type II artificial cornea sheet type to obtain the type II collar button artificial cornea of the present invention. Using the type II collar button artificial cornea of the present invention can better clamp the eyelids, reduce the detachment rate of the artificial cornea, and can be better fixed inside the eye. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the type II collar button artificial cornea of the present invention.

[0017] Figure 2 It is a schematic structural diagram of an embodiment of the rear plate of the present invention.

[0018] In the figure: 1. Front plate, 2. Optical lens column, 3. Skirt, 4. Spacer, 5. Front surface of the spacer, 6. Front surface of the skirt, 7. Rear surface of the skirt, 8. Front surface of the front plate, 9. Rear surface of the front plate, 10. Rear plate, 11. Middle hole of the rear plate, 12. Annular groove, 13. Side hole, 14. Circular ridge. Detailed implementation manner

[0019] To better illustrate the purpose, technical solution and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0020] As Figure 1 shown, a type-II collar button-shaped artificial cornea includes a front plate 1 with an optical lens column 2. A skirt 3 is annularly arranged on the outer side surface of the optical lens column 2. A spacer 4 is also annularly arranged on the outer side surface of the optical lens column 2. The spacer 4 is located between the front plate 1 and the skirt 3, and the spacer 4 is in contact with the skirt 3. Due to the presence of the spacer, the gap between the front plate 1 and the skirt 3 is reduced, resulting in a change in the surgical method. The Boston type-II artificial cornea needs to be fixed through the eyelid, while the type-II collar button-shaped artificial cornea of the present invention does not require opening the eyelid, and only an auricular cartilage or conjunctival flap needs to be padded inside.

[0021] By providing the spacer 4, the length (L1-L3) of the part of the optical lens column 2 located between the front plate 1 and the spacer 4 is preferably 1.3-1.7 mm. L1 is the distance between the rear surface 9 of the front plate 1 and the outer circle of the front surface 5 of the spacer 4 in the center line direction of the spacer 4, and L3 is the distance between the inner circle and the outer circle of the front surface 5 of the spacer 4 in the center line direction of the spacer 4.

[0022] In order to better fit with the skirt, the front surface 5 of the spacer 4 is designed with a convex arc, the rear surface of the spacer 4 is designed with a concave arc, and the rear surface of the spacer 4 is in contact with and bonded to the front surface 6 of the skirt 3.

[0023] Preferably, the diameter of the outer circle of the spacer 4 is the same as the diameter of the front plate 1.

[0024] Preferably, the diameter of the outer ring of the gasket 4 is 4.5 - 4.7 mm, the diameter of the inner ring of the gasket 4 is 3 - 3.5 mm, the thickness of the inner ring of the gasket 4 (the distance between the inner ring of the front surface 5 and the inner ring of the rear surface of the gasket 4 in the central line direction of the gasket 4) is 0.5 - 0.9 mm, the distance L3 between the inner ring and the outer ring of the front surface 5 of the gasket 4 in the central line direction of the gasket 4 is 0.1 - 0.2 mm, the thickness of the gasket 4 (the distance between the inner ring of the front surface 5 and the outer ring of the rear surface of the gasket 4 in the central line direction of the gasket 4) (L3 + L2) is 0.6 - 1.0 mm, and the thickness of the skirt 3 (the distance between the inner ring of the front surface 6 and the outer ring of the rear surface 7 of the skirt 3 in the central line direction of the skirt 3) is 0.6 - 1.0 mm. L2 is the distance between the outer ring of the front surface 5 and the outer ring of the rear surface of the gasket 4 in the central line direction of the gasket 4.

[0025] Generally speaking, the front surface 8 of the front plate 1 is designed with a convex arc, the rear surface 9 of the front plate 1 is a plane, and the optical lens column 2 is located at the center of the rear surface 9 of the front plate 1.

[0026] Preferably, the diameter d1 of the front plate 1 is 4.5 - 4.7 mm, the distance L4 between the edge of the front surface 8 and the edge of the rear surface 9 of the front plate 1 is 0.5 - 0.7 mm, and the diameter of the optical lens column 2 is 3.3 - 3.5 mm.

[0027] Generally speaking, the front plate 1, the optical lens column 2 and the skirt 3 are of an integral structure, and the materials of the front plate 1, the optical lens column 2, the skirt 3 and the gasket 4 are all PMMA (polymethyl methacrylate). Preferably, the materials of the front plate 1, the optical lens column 2, the skirt 3 and the gasket 4 are all medical PMMA (polymethyl methacrylate).

[0028] As Figure 2 shown, the type II collar button-shaped artificial cornea further includes a rear plate 10 with a central hole 11 matching the optical lens column 2. An annular groove 12 for clamping the rear plate 10 is provided around one end of the outer side of the optical lens column 2 away from the front plate 1. The skirt 3 is located between the annular groove 12 and the front plate 1, and a plurality of side holes 13 are provided on the rear plate 10. The side holes are provided to facilitate the passage of aqueous humor.

[0029] Further, the rear plate 10 is a disc, and 16 side holes 13 are provided on the rear plate 10. The centers of 8 of the 16 side holes are located on a first circumference, the center line of the first circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal; the centers of the other 8 side holes among the 16 side holes are located on a second circumference, the center line of the second circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal, and the diameters corresponding to the first circumference and the second circumference are not equal. Preferably, the diameter corresponding to the first circumference is 4.7 - 4.9 mm, the diameter corresponding to the second circumference is 6.55 - 6.85 mm, the diameters of the 16 side holes 13 are all 1.0 - 1.2 mm, and the included angle formed by the connecting lines between the centers of two adjacent side holes on the first circumference and the second circumference and the center of the middle hole of the rear plate is 22.5°.

[0030] Preferably, the inner diameter of the rear plate 10 is 2.7 - 2.9 mm, and the outer diameter of the rear plate 10 is 8.4 - 8.6 mm.

[0031] Generally, the rear plate 10 is an arc-shaped disc, and the front and rear surfaces of the rear plate 10 are both arc-shaped.

[0032] Preferably, the arc radius of the front surface of the rear plate 10 is 7.75 mm, the arc radius of the rear surface of the rear plate 10 is 7.9 - 8.1 mm, the front and rear surfaces of the rear plate 10 are transitioned by an arc, the arc radius of the arc between the front and rear surfaces of the rear plate 10 is 0.12 - 0.15 mm, and the thickness of the rear plate 10 (the distance between the inner circle on the rear surface of the rear plate 10 and the outer circle on the front surface in the center line direction of the rear plate 10) is 1.25 - 1.35 mm.

[0033] Further, a circular ridge 14 is provided on the rear plate 10, and the center line of the circular ridge 14 coincides with the center line of the rear plate 10.

[0034] Preferably, the inner diameter of the circular ridge 14 is 2.7 - 2.9 mm, the outer diameter of the circular ridge 14 is 3.35 - 3.65 mm, and the thickness of the circular ridge 14 is 0.25 - 0.45 mm.

[0035] Generally, the rear plate 10 is a medical titanium disc, and the circular ridge 14 is a metal ridge.

[0036] Usage method of the type II collar button-shaped artificial cornea of the present invention:

[0037] (1) Auricular cartilage preparation: Make a 15-mm vertical skin incision at the upper and dorsal 1 / 4 of the ipsilateral ear, and dissect the subcutaneous tissue to expose the cartilage. Then, harvest a 12×10-mm auricular cartilage for later use.

[0038] (2) Exposure of corneal stroma and scleral surface: Separate the conjunctival tissue to fully expose the corneal and scleral tissues 5 mm away from the limbus corneae, which is used for subsequent corneal surgery and vitrectomy. For patients with limited conjunctival sac, the conjunctival tissue should be preserved as much as possible; otherwise, the conjunctival sac will be reconstructed with oral mucosa.

[0039] (3) Assembly of the type-II snap-on artificial cornea of the present invention: Excise the donor corneal epithelium, and prepare a corneal button with a central hole having a diameter of 3 mm (the diameter of the corneal button is 8.5-9.0 mm) (usually the donor cornea is 0.5-1.0 mm larger than the recipient bed) as the donor cornea by trephination. When using an autologous cornea, a corneal button with a central hole having a diameter of 2.75 mm (the diameter of the corneal button is 8 mm) is suitable for implantation. Mount the donor cornea onto the optical lens column 2 between the skirt 3 and the annular groove 12, and mount the rear plate 10 onto the annular groove 12.

[0040] (4) Implantation of the type-II snap-on artificial cornea of the present invention: Trephine the host cornea, and remove the lens if necessary. Anterior vitrectomy is performed by pars plana vitrectomy (PPV) and a 25G system. At the same time, perform a clinical evaluation of the fundus (including the macula and optic disc). Similar to standard penetrating keratoplasty, the assembled type-II snap-on artificial cornea device is sutured intermittently on the recipient bed. According to the glaucoma diagnosis and postoperative prognosis, Ahmed glaucoma drainage devices (GDDs) can be implanted simultaneously.

[0041] (5) Cartilage reinforcement: Trim the autologous auricular cartilage into the desired shape to fit the ocular surface, and drill a hole with a diameter of 3 mm in the center to fix the lens column. Make a radial incision on the autologous auricular cartilage to wrap the lens column, and then suture the incision to close. After that, further fix the cartilage to the ocular surface using 7-0 sutures. To achieve a better effect, it is recommended to cover the edge of the auricular cartilage with an allogeneic corneoscleral ring and further suture it to the patient's sclera.

[0042] (6) Suture the fascia sac and conjunctiva layer by layer to further cover and reinforce the cartilage. If the conjunctival sac is insufficient, lid skin without tarsus can be used to make the artificial cornea lens column protrude through the closed lid skin.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A type II collar-button artificial cornea, characterized in that, It includes a front plate with an optical lens column, a skirt is annularly arranged on the outer side surface of the optical lens column, a gasket is also annularly arranged on the outer side surface of the optical lens column, the gasket is located between the front plate and the skirt, and the gasket is in contact with the skirt.

2. The type II collar button-shaped artificial cornea according to claim 1, wherein, The length of the part of the optical lens column between the front plate and the gasket is 1.3 - 1.7 mm.

3. The type II collar button-shaped artificial cornea according to claim 1, wherein, The front surface of the gasket is designed with a convex arc, the rear surface of the gasket is designed with a concave arc, and the rear surface of the gasket is in contact with and bonded to the front surface of the skirt.

4. The type II collar button-shaped artificial cornea according to claim 1, characterized in that, The diameter of the outer circle of the gasket is the same as the diameter of the front plate.

5. The type II button-shaped artificial cornea according to claim 1, wherein, The diameter of the outer circle of the gasket is 4.5 - 4.7 mm, the diameter of the inner circle of the gasket is 3 - 3.5 mm, the thickness of the inner circle of the gasket is 0.5 - 0.9 mm, the distance between the inner circle and the outer circle of the front surface of the gasket in the direction of the gasket center line is 0.1 - 0.2 mm, the thickness of the gasket is 0.6 - 1.0 mm, and the thickness of the skirt is 0.6 - 1.0 mm.

6. The type II button-shaped artificial cornea according to claim 1, wherein The front surface of the front plate is designed with a convex arc, the rear surface of the front plate is flat, and the optical lens column is located at the center of the rear surface of the front plate.

7. The type II collar button-shaped artificial cornea according to claim 1, wherein The diameter of the front plate is 4.5 - 4.7 mm, the distance between the edge of the front surface and the edge of the rear surface of the front plate is 0.5 - 0.7 mm, and the diameter of the optical lens column is 3.3 - 3.5 mm.

8. The type II button-shaped artificial cornea according to claim 1, wherein, The front plate, the optical lens column and the skirt are of an integral structure, and the materials of the front plate, the optical lens column, the skirt and the gasket are all PMMA.

9. The type II collar button-shaped artificial cornea according to claim 1, characterized in that, It further includes a rear plate with a central hole matching the optical lens column. An annular groove for clamping the rear plate is annularly arranged at one end of the outer side surface of the optical lens column far from the front plate. The skirt is located between the annular groove and the front plate, and a plurality of side holes are provided on the rear plate.

10. The type II button-type artificial cornea according to claim 9, wherein, The rear plate is a disc. There are 16 side holes on the rear plate. The centers of 8 of the 16 side holes are located on a first circumference. The center line of the first circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal; the centers of the other 8 of the 16 side holes are located on a second circumference. The center line of the second circumference coincides with the center line of the disc, and the center distances between adjacent side holes among the 8 side holes are all equal. The diameters corresponding to the second circumference and the first circumference are not equal.

Images